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Officers were looking for the man in the streets around the High Street, including Cameron Drive, which is only yards away from where a 15-year-old was stabbed to death in Hurst Drive last month.

A spokeswoman for the Hertfordshire Constabulary said: "A search was conducted but the man was not located. Enquiries are on-going at this stage to identify the offender.

"Anyone with information that could assist police is asked to contact Hertfordshire Constabulary non-emergency number 101, quoting ISR 762 of January 12, 2018, or report information online at www.herts.police.uk/report.

"Alternatively, you can contact the independent crime-fighting charity Crimestoppers anonymously on 0800 555 111 or through their Anonymous Online Form at www.crimestoppers-uk.org. No personal details are taken, information cannot be traced or recorded and you will never need to go to court."